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Full Discussion: iSCSI speed problems
Top Forums UNIX for Advanced & Expert Users iSCSI speed problems Post 302205809 by jeriryan87 on Monday 16th of June 2008 10:33:20 AM
Old 06-16-2008
iSCSI speed problems

Hi all. I was able to set up an IBM Ultrium LTO 4 tape drive to use iSCSI (using open-iscsi drivers) to communicate with Red Hat, but it's going really slow, maxing out in tar and dd tests at like 16 MB/s (using a block size of 128k). The thing is rated for 30MB/s. I feel like even though I have a Gigabit ethernet setup, its only utilizing 100MBit. I have no idea how to mess with network settings either in Red Hat or open-iscsi. Any ideas on what to do, either network or otherwise?

Last edited by jeriryan87; 06-16-2008 at 03:14 PM..
 

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ISCSI_INITIATOR(4)					   BSD Kernel Interfaces Manual 					ISCSI_INITIATOR(4)

NAME
iscsi_initiator -- kernel driver for the iSCSI protocol SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file: device iscsi_initiator Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): iscsi_initiator_load="YES" DESCRIPTION
This driver, along with its userspace counterpart iscontrol(8), is obsolete. Users are advised to use iscsi(4) instead. The iscsi_initiator implements the kernel side of the Internet SCSI (iSCSI) network protocol standard, the user land companion is iscontrol(8), and permits access to remote virtual SCSI devices via cam(4). SYSCTL VARIABLES
debug.iscsi_initiator set the debug-level, 0 means no debugging, 9 for maximum. net.iscsi.isid the initiator part of the Session Identifier. kern.cam.cam_srch_hi=1 allow search above LUN 7 for SCSI3 and greater devices. the following are informative only: net.iscsi.driver_version the current version of the driver. net.iscsi.sessions the number of current active sessions. net.iscsi.n.targetname is the targe name of session n. net.iscsi.n.targeaddress is the IP address of the target of session n. net.iscsi.n.stats are some statistics for session n net.iscsi.n.pid is the process id of the userland side of session n, see iscontrol(8). FILES
The iscsi_initiator driver creates the following: /dev/iscsi used to create new sessions. /dev/iscsi%d for each new session. SEE ALSO
cam(4), camcontrol(8), iscontrol(8) STANDARDS
iSCSI RFC 3720 AUTHORS
This software was written by Daniel Braniss <danny@cs.huji.ac.il> BUGS
The lun discovery method is old-fashioned. BSD
October 9, 2014 BSD
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